Carbon gland



C. A. PARSONS, S. S. COOKAND L. M. DOUGLAS.

CARBON GLAND.

APPLICATION FILED JULY 19, 1919..

1 ,33 1 ,3 6 l Patented Feb. 17, 1920.

UNITED STATES PATENT OFFICE.

CHARLESALGERNON, PARSONS, STANLEY SMITH COOK, AND LOUIS MORTIMER DOUGLAS,. OF NEWCASTLE-UPON-TYNE, ENGLAND; SAID COOK AND SAID DOUGLAS ASSIGNORS TO. SAID. PARSONS.

CARBON GLAND;

Originalapplicaticn filed October 5,1918, Serial No.

T0 all whom it. may concern Be it known that we, CHARLES ALGERNON PARSOES, K. C. 13., STANLEY SMITH Coon, and LOUIS MORTIMER DOUGLAS, allsubjects of the liing ofGreat Britain and Ireland, and all residingcatHeaton..IVorks, Newcastle-upon=T 'yne, in the county of Northun berla-nd, England, have invented certain new and useful Improvements in Carbon Glands, of which the following is a specification.

This invention relates to carbon glands for packing rotating shafts and has for its object to produce a carbon gland-ring capable of sustaining higher pressures than have been hitherto carried and having greatly reduced friction while being more reliable than has hitherto been the case with such gland-rings,

The invention is more particularly concerned with the type of gland-ring described in our co-pending application No. 257080 from which this is a divisional application.

Carbon glands as heretofore designed consist of rings, each ring being made up of sectors of graphitic carbon usually of rectangular cross section, embracing the rotating shafts and held together by a spring encircling them, the purpose of such carbon gland-ring being to baflie the flow of steam from a higher pressure on one side of it to a lower pressure on the other. The outer periphery 'of the gland-ring is in such case subjected over its whole area to the higher pressure, while its inner periphery, which is in contact with or is bored to fit the surface of the shaft, is subject to a lower average pressure owing to the fall of pressure from the high pressure side to the low pressure side. It follows, therefore, that there is a radial inward force on the ring pressing it toward the shaft, thus give ing rise to friction, absorbing power and producing a corresponding amount of heat.

The present invention consists broadly in constructing gland-rings in such a manner that they are substantially in radial equilibrium under the steam pressure.

The invention further consists in forming the gland-rings of L shape with the extension along the shaft toward the low pres sure side, a space being provided between the back of the extended portion and the Specification of Letters Patent.

Serial chamber is 'ovided between the Patented Feb. 1'7, 1920,

257,080. IT-ividedand this application filed July 19, No. 312,054.

housing of the gland-ring, which space is exposed to the lower pressure.

The invention stillI further consists in divided glandrings of L shape having a portion of each segment bearing on the shaft itself and a portion. bearing on a collitlzfOI-RlEQl thereon, the portions being separated by a chamber containing steam at an intermediate pressure.

The invention also consists in the improved carbon glands hereinafter described.

The figure is a longitudinal section of the packing showing its position with the shaft.

In carrying the invention into eifect according to the example illustrated, the gland is made up of a number of L shaped segments (4 with extensions a lying along the shaft toward the low pressure side. A space Z) is allowed between the housing of the gland and the back of the extended portion of each carbon sector, and this space is exposed to the low pressure. In this manner while retaining the same width of ring (in an axia direction) as would normally exist in an ordinary ring of rectangular section the inward pressure of the steam on the gland-ring may be made substantially equal to the outward pressure, there being high pressure orer the periphery of the glandring on the high pressure side and low pressure over the back of the extension on the low pre sure side, these two pressures acting against the outward radial pressure which varies along the shaft from the higher to the lower value. The rotating shaft is shown 0 (Z, and a is the high pressure and (Z the low pressure end.

The shaft is formed with a collar 6 and the carbon segine are stepped and a I L 1 steps; the steam in tl is chamber is at an intermediate If I so the tilting force is reduced.

were with a leak off to the low presside may also be formed on the low ire face of t This insures a 1 1 [IO gland.

face which causes the ce -ter of pressure to be farther away from the iaft and so reeuces the tendency to tilt.

s of the invention the rings are lly in equilibrium in the radial direction under the steam pressure so that friction against the shaft is reduced and higher r total pressure to force the carbon.

steam pressures across the gland-rings can be allowed. c 7 f In consequence of the reducedfrlctlon and reduced heating a more reliable gland is obtained.

7 It is usually preferable to leave a slight balance of pressure in the inward radial di- I together by any other suitable means.

Having now described our invention, what we clann as new and desire to secure by Letters Patent 1s 1. Incarbon and like glands for rotating v shafts comprising. packing rings divided into segments each with, an extension projecting toward the low pressure end of the shaft, segments having a portion bearing on the shaft itself and a portion'bearing on a collar formed thereon, the portions being separated by a chamber containing steam at an intermediate pressure.

' 2. In carbon and like glands as set forth inclaiin i a groove inthe housing opposite the face of the ring which is toward the low pressure side, said groove being in communication with the low pressure steam sub stantially as described.

In testimony whereof we have signed our names to this specification. V

Q CHARLES ALGERNON PARSONS.

. STANLEY SMITH COOK.

LOUIS MORTIMER DOUGLAS 

